For unlocking the key doors for key%, download the save file found in Resources and follow these steps:

1. If you have Flash Player Standalone on Windows 10, go to C:\Users*YourName**\AppData\Roaming\Macromedia\Flash Player#SharedObjects*Assortment of Numbers & Letters**\localhost\ And then go to the same folder you put the game's swf file
2. Make sure you make a backup of the .sol file found in the folder if you don't want your old save data to be overwritten
3. Replace the .sol file with the one you downloaded, and now you can run key%!